Follow this video and you can play:
- Open user.xml in Steam\steamapps\common\TreeOfSavior\release
- Edit mode in to 2 with any width and height (img)
- Open the game
- Press enter in server list menu
- After that, immediately press close at the top right and leave the confirmation dialogue open
- Wait for 5-10 seconds and then press “cancel” in the dialogue
- You should be in the character selection menu!